丘脑非特异投射系统的主要作用是
A.引起触觉
B.引起牵涉痛
C.调节内脏活动
D.维持大脑皮层的兴奋状态
E.维持睡眠状态
参考答案:D
Not only _____ hard but also _____ a high sense of responsibility.[ ]
A. does she work; she has
B. she works; has she
C. does she work; does she have
D. she works; she has
中小容量的异步电动机通常用热继电器实现过载保护。